Outdoor Research Helios Sun Hat (junior)
One of the best sun hats you can get for your little adventurer! It's got an all-around foam stiffened brim for protection and a toggled chin cord to keep it on when the wind gets up. It also offers UPF 50+ protection - AND it floats.
To fit, measure around child's head where the hat would sit.
XS age 0-1, 47cm
S age 1-3, 51cm
M age 3-8, 53cm
L age 8-12, 57cm